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They mention later in the article that the 500ms is p75.

Realistically 50ms p75 should be achievable for the level of complexity in the shopify app.

P75. I can only image the p90 and p99 are upwards of 1 second.

Agreed. The P95 and P99 in particular are likely to be over 1 second, possibly over 2. They chose P75 to be able to post a seemingly impressive number.

I personally wouldn't be very happy with a P75 of 500 ms. It's slow.

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